split.sh: append .vcf suffix, only, to end of file

[mdengler]

This commit makes the output files of split.sh end in .vcf and strips any internal ".vcf":

$ split.sh bigfile.vcf
$ ls
bigfile.vcf
bigfile-00000000.vcf
bigfile-00000001.vcf
bigfile-00000002.vcf
...

Currently in l0b0/vcard/master, split.sh results in:

$ split.sh bigfile.vcf
$ ls
bigfile.vcf
bigfile.vcf00000000
bigfile.vcf00000001
bigfile.vcf00000002
...

[l0b0]

Thanks for the patch, it would be a good addition for human-readable filenames. But I think it would have to be a non-default option - it's easier to use the original code with other scripts, since it's easier to parse a number at the end of the filename than in the middle. I'd suggest using getopt to parse parameters, like this script, and adding either --digits=8 or --suffix-format "-%08d.vcf" to the csplit options.

[mdengler]

Fair enough -- I didn't see that split.sh was used with other scripts. I've always used basename and cut for this type of parsing in scripts. I find leaving the file extension (which has many other uses) and using my suggested suffix that starts with a "-" is easy to read for humans and to parse for scripts: a little basename ... .vcf here and a cut -d- -f... there and there is a lot one can do.